I have a 1990 GMC K1500, stalling issues.
the truck will start up most time fine with a little gas, after about 30 seconds in idle it will do an
irregular idle and then stall out. Also when I put the truck into reverse or drive without my foot on the
gas pedal it will stall out. I can drive the truck as long as my foot is on the pedal giving it a little gas
when I'm at a stop light.
So far I have replace the IAC, PT sensor, ECS module, Ignition module, spark plugs, distributor cap and
wires, fuel pump relay, fuel filter, i have cleaned the carburetor with cleaner spray.Please help!!
Have you tested the fuel pressure? Sounds like the pump is dying.
So, I changed my fuel filter again and it's running much better but is still stalling, I haven't done a fuel pressure test yet but while I was under changing the fuel filter I saw a pretty major exhaust crack. Do you think this has something to do with the symptoms?
If the exhaust was bent I'd say yea but no not a hole. I'm still betting on the pump.
Bloomington ca.... I have a 90 GMC 1500 5.7 have almost the same problems i dont have the same problem but i dont need to keep my foot on the peddle when you punch it too fast the idle drops and stalls cause its in a high idle i have everything brand new but the fuel pump i was told that it could be the computer i replaced it and its still doing the same thing i took it the mechanic and he had it on computers i was told it was the transmission can i took it to the transmission shop and its okay i was told it could be the wire harness it could be a short so i look at it and still havent found anything yet.... im still stuck on it im getting ready to get rid of the truck!!!
What is your fuel pumps pressure
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